PA.RT 1, 1914] CARDUACEAB : HELENIEAE 31 



23. OXYPAPPUS Benth. Bot. Voy. Sulph. 118. 1845. 



Annual herbs. Leaves opposite, or those of the branches partly alternate, simple. 

 Heads radiate, small, corymbose-paniculate. Involucre hemispheric; bracts uniserial, equal, 

 linear, concave, rounded on the back. Receptacle conic, naked. Ray-flowers pistillate, 

 fertile; ligules linear, 3-nerved, 3-toothed. Disk-flowers many, hermaphrodite, fertile; tube 

 narrow, shorter than the cylindric throat; lobes short. Anthers not caudate, with lanceolate 

 tips. Style-branches filiform, acute, scarcely hirtellous. Achenes linear, 4-5-angled or those 

 of the ray-flowers 3-angled, slightly contracted at the apex, striate on the faces. Pappus of 

 4 or 5, or in the ray-flowers only 3, subulate squamellae ending in long scabrous awns. 



Type species, Chrysopsis scabra H. & A. 



1. Oxypappus scaber (H. & A.) Benth. Bot. Voy. Sulph. 118. 1845. 



Chrysopsis scabra H. & A. Bot. Beech. Voy. 434. 1841. 



Pedis Seemannii Schultz-Bip; Seem. Bot. Voy. Herald 309. 1856. 



Pentachaeta gracilis Benth.; Hook. Ic. 12: 1. 1872. 



Oxypappus gracilis A. Gray; O. Hoffm. in E. &. P. Nat. Pfl. 4^: 257. 1890. 



A slender branched annual; stem 2-4 dm. high, hispid or glandular-scabrous above; 

 lower leaves crowded and subrosulate, oblanceolate, 3-5 cm. long, dentate, hirsute with 

 crisp hairs; stem-leaves lanceolate, dentate, opposite; those of the branches linear and bract- 

 like, entire, often alternate; involucre 4 mm. high, 6 mm. broad, glandular-puberulent ; 

 bracts about 15, linear; ligules yellow, about 5 mm. long, 1-1.5 mm. wide; disk-corollas 

 about 4 mm. long, yellow; achenes black, scarcely 2 mm. long; squamellae 3 mm. long. 



Type locality: Between San Bias and Tepic, Territory of Tepic. 



Distribution: Jalisco and Tepic. 



Illustrations: Benth. Bot. Voy. Sulph. pi. 42; Hook. Ic. pi. 1101. 



24. MICROSPERMUM Lag. Gen. & Sp. Nov. 25. 1816. 



Miradora Schultz-Bip.; Benth. & Hook. Gen. 2: 407, as synonym. 1873. 



Perennial herbs with creeping rootstocks. Stems decumbent, rooting. Leaves opposite, 

 petioled, with dentate blades. Heads solitary, peduncled. Involucre hemispheric; bracts 

 narrow, in 1-2 series, equal in length, double-ribbed on the back. Receptacle convex, naked. 

 Corollas all 5-toothed and hermaphrodite, but the marginal ones enlarged, oblique with the 

 three outer lobes much larger and stamens abortive ; disk-corollas regular, with a campanulate 

 throat. Anthers short, truncate at the base. Style-branches with subulate very acute 

 appendages. Achenes obovoid-oblong, 4-angled, glabrous or hirtellous on the angles. Pappus 

 a minute crown and 0-3 awns (?). 



Type species, Microspermum nummulariaefolium Lag. 



1. Microspermum nummulariaefolium Lag. Gen. & Sp. Nov. 25. 



1816. 



Microspermum debile Benth. PI. Hartw. 64. 1840. 



Miradora Sartori Schultz-Bip.; Benth. & Hook. Gen. 2: 407, as synonym. 1873. 



A creeping perennial herb; stems decumbent or the upper part ascending; petioles about 

 1 cm. long; leaf-blades ovate, crenate, cuneate at the base, glabrous or sparingly hirtellous; 

 1.5-3 cm. long; peduncles 4-5 cm. long; heads solitary; involucre hemispheric; bracts 

 subequal, lanceolate, glandular-pubescent, 3 mm. long; marginal flowers very oblique; limb 

 5-6 mm. long; achenes obovoid-oblong, slightly angled, hirtellous on the angles. 



Type; locality: Guanajuato, Mexico. 

 Distribution: Vera Cruz to Guanajuato and Oaxaca. 



Subtribe 5. BAHIANAE. Heads radiate or discoid. Involucre hemi- 

 spheric to campanulate; bracts mostly broad, flat, appressed, thin, neither mem- 

 branous nor conspicuously colored on the margin. Ray-flowers when pres- 

 ent corollas; ligulate yellow or white, rarely tinged with purple, deciduous. 



